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After a lot of conventional power-generating units at the local end-to-end power grid have been replaced, the new energy-generating units do not participate in the active response of the system through the grid connection of the converter, which reduces transient stability due to the reduction of the inertia of the local grid. Firstly, based on the principle of transient energy, the mechanism of the moment of inertia of the local power grid is established by affecting the fault removal angle, and then the acceleration energy during the fault and the deceleration energy after the fault is removed is revealed. Based on the equal area rule, the relationship between the inertia and the transient stability limit, and the static stability limit before and after the fault is deduced, and the minimum engineering moment of inertia required to ensure the transient stability of the system at a certain output power level at the transmitting-end grid is given. The algorithm and simulation example analysis verify the effectiveness and practicability of the proposed method.